This paper presents a review of number works devoted to the studies high-entropy alloys (HEAs). As is known, HEAs represent new class materials that have attracted attention scientists due their unique properties and prospects application in hydrogen power engineering. The peculiarity high entropy mixing, which provides phase stability flexibility developing with given characteristics. main focus this on for solid-state storage, physicochemical mechanical properties, synthesis technologies....

This study aimed to develop an alternative surface hardening technique for low-carbon steel alloy type 20Ch using plasma electrolytic oxidation (PEO). The of samples was achieved through PEO in a Na2CO3 electrolyte solution. Optimal processing parameters were determined experimentally by measuring voltage and applied current. Quenching performed the stream, ionised excitation. A mathematical model based on thermal conductivity equations regression analysis developed relate key process....

Investigated the fragmented substructure of steel 30CrMnSiA after heat treatment and deformation. Found that is main component α-phase (~ 96%), γ- phase 3%) present in material form residual austenite. Batch martensite 0.7 on volume α- plate - 0.3. Most (1.5%) located martensite, lowest a packet 0.5%). In unfragmented batch austenite an amount 1%. process deformation structure formed completely destroyed fraction anisotropic fragments 25%, 75%-isotropic. Electron microscopic studies have...

This work is devoted to the research of influence technological parameters electrolytic plasma surface hardening on structure and tribological properties samples retaining steel mark 2. In was carried out in an electrolyte from aqueous solution 20% urea sodium carbonate. According result metallographic X-ray diffraction analysis, it determined that phase composition 2 after processing varies, fine martensite with a small amount troostite iron oxide formed samples. Tribological experiments...

This work deals with the study of changes in dislocation structure and quantitative characteristics, as well morphological components, 0.34Cr-1Ni-Mo-Fe steel before after plasma electrolytic hardening. According to electron microscopic studies fine hardening, is a multiphase material containing an α-phase, γ-phase (retained austenite), cementite carbide phase. It was revealed that, morphologically, α-phase initial state, generally, present form of: lamellar pearlite volume fraction 35%,...

In work it was studied the influence of intensive plastic deformation on structure and mechanical properties aluminum alloys. Intensive carried out by using equal-channel angular extrusion. It is shown that most efficient angle intersection channels Φ=120°, which ensures defect-free parts at highest possible level accumulated strain (e=8). established milling grain structures in alloys AMG6 AMC occurs ECAE-12 passes, while 120°. After refinement reaches to size ∼⃒1.0-1.5 gm. determined as a...

The process of plasma electrolytic oxidation (PEO) allows to obtain multifunctional coatings with unique properties, including wear-resistant, corrosion-resistant, heat-resistant, electrical insulating and decorative. Therefore, the field application these is quite wide: medicine, aircraft construction, shipbuilding, instrumentation, automotive other industries. technology based on phenomenon micro-arc discharges promoting formation oxide layers metal surfaces. In this review technologies...

Abstract The grainary substructure of 30CrMnSi steel has been studied after rolling deformation. It found that in the material bulk share anisotropic grains amounts to 25% and isotropic 75%. observed martensitic structure is completely broken process.

In this work, the adhesive and tribological characteristics of (TiZrNbYAl)N multilayer coatings were studied. The main goal work is to assess influence number layers on coating deposited 12Х18Н9Т steel substrates. A study distribution elements over depth using Auger electron spectroscopy showed that chemical are distributed quite evenly cross section element curves have sharp peaks. presence iron in composition at a more than 2 microns side indicates an increase electrical displacement...

The paper presents the results of study a high-entropy coating AlCrCoFeNi system obtained using mechanochemical synthesis and deposited on 40X steel substrate by detonation sputtering. unique microstructural mechanical properties this have been thoroughly investigated, including detailed analysis phase distribution hardness material. A cross-sectional revealed uniform components, which contributes to its performance characteristics. X-ray diffraction showed complex multiphase structure...

This paper examines the influence of electrolyte-plasma surface hardening on structure and microhardness wheel steel mark 2. In work was carried out in an electrolyte made from aqueous solution 10 % carbamide (NH2)2CO 20 sodium carbonate Na2CO3. The processing time 2 seconds, Tmax = 850–900 ºC; U= 320V; I=40A. According to results scanning transmission electron microscopy, caused a change morphological constituents steel. initial state, matrix is α-phase, components which are fragmented...

Using optical and electron microscopy also X-ray diffraction laws were investigated of carbide phases particles redistribution in the roll near-surface layers (at surface at distance 0.5 mm, 2 mm from surface) made 30CrMnSiА steel during hot deformation. There are located borders joints isotropic anisotropic fragments inside these fragments. Shows dependence volume fraction (cementite special carbides). different structural components locations layer. a relationship carbides with dislocation...

Using electron microscopy were investigated character of change microdiffraction pattern fragmented substructure, the relationship between average size micrograins, which forming diffraction pattern, and point reflections number on ring. Also integrated degree plastic deformation was assessed in roll surface layers, made steel 30CrMnSi during hot deformation. It shown that fragments generated considerably disoriented with respect to each other. Formed by heat treatment practically is not...

The article presents a review of the results research on high-entropy alloys, describing principles their formation, basic concepts and properties alloys. existing categories entropic alloys are listed. effects resulting from formation described: high entropy, lattice distortion, sluggish diffusion cocktail effects. It is noted that traditional thermodynamic representations for multicomponent require additions. also application Hume-Rothery rules to predict phase composition shows some...

The study was carried out by means of transmission electron microscopy on thin foils to investigate the changes in matrix morphology and phase composition occurring ferritic-pearlitic steel St2 grade (Russian) under plasma electrolytic surface quenching. In original state is a material which underwent quenching temperature 890 °C (2 – 2.5 h) with cooling into warm water (30 60 °C) further tempering 580 °С (2.5 3 h). Surface conducted aqueous salt solution during 4 seconds 850 900 °C, voltage...

Electron microscopy and x-ray analysis mechanical testing have been investigated the influence of severe plastic deformation on structure properties aluminum alloys. It is established that in initial state alloy AMC has a high density chaotically distributed dislocations with 5-10*109 сm-2. shown microdiffraction paintings bulk grains are observed uniformly particles second phase. AMG6 there 2-6 *1010 Determined after ECAP dislocation alloys AMG6, changes: formed networks inside fragments...

This work is devoted to the research of influence technological parameters electrolytic-plasma surface hardening on structure and tribological properties samples retaining steel Mark 2. Electrolytic-plasma was carried out in an electrolyte from aqueous solution 10% urea sodium carbonate. According result metallographic X-ray diffraction analysis, it determined that phase composition 2 after processing varies, fine martensite with a small amount troostite iron oxide formed samples....

In this work, to assess the radiation damage of beryllium under low-temperature neutron irradiation, samples from grade TShG-200 with an oxide phase concentration about 1 wt % were studied, which kept in IVG.1M research reactor for a long time and irradiated fluences 0.8–4·10 20 neut./cm 2 . Also, unirradiated original witness same brand tested compare results.The aim was establish level degradation during their tests reactor. Mechanical three-point bending tension performed determine...

We have studied fragmentary substructure of 30CrMnSiA steel after rolling deformation. It has been stated that in the material bulk share anisotropic fragments makes 25% and isotropic is 75%. found out martensite structure completely broken process